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fixed minor corner case

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This commit is contained in:
Yann Collet 2016-10-17 17:28:28 -07:00
parent 2b361cf2f1
commit 06573e17be
1 changed files with 2 additions and 1 deletions
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3
lib/decompress/zstd_decompress.c
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@ -807,7 +807,8 @@ static seq_t ZSTD_decodeSequence(seqState_t* seqState)
if (ofCode <= 1) { if (ofCode <= 1) {
offset += (llCode==0); offset += (llCode==0);
if (offset) { if (offset) {
size_t const temp = (offset==3) ? seqState->prevOffset[0] - 1 : seqState->prevOffset[offset]; size_t temp = (offset==3) ? seqState->prevOffset[0] - 1 : seqState->prevOffset[offset];
temp += !temp; /* 0 is not valid; input is corrupted; force offset to 1 */
if (offset != 1) seqState->prevOffset[2] = seqState->prevOffset[1]; if (offset != 1) seqState->prevOffset[2] = seqState->prevOffset[1];
seqState->prevOffset[1] = seqState->prevOffset[0]; seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset = temp; seqState->prevOffset[0] = offset = temp;